2 * SCSI Block Commands (SBC) parsing and emulation.
4 * (c) Copyright 2002-2013 Datera, Inc.
6 * Nicholas A. Bellinger <nab@kernel.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/ratelimit.h>
26 #include <linux/crc-t10dif.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_proto.h>
29 #include <scsi/scsi_tcq.h>
31 #include <target/target_core_base.h>
32 #include <target/target_core_backend.h>
33 #include <target/target_core_fabric.h>
35 #include "target_core_internal.h"
36 #include "target_core_ua.h"
37 #include "target_core_alua.h"
40 sbc_check_prot(struct se_device
*, struct se_cmd
*, unsigned char *, u32
, bool);
41 static sense_reason_t
sbc_execute_unmap(struct se_cmd
*cmd
);
44 sbc_emulate_readcapacity(struct se_cmd
*cmd
)
46 struct se_device
*dev
= cmd
->se_dev
;
47 unsigned char *cdb
= cmd
->t_task_cdb
;
48 unsigned long long blocks_long
= dev
->transport
->get_blocks(dev
);
55 * If the PMI bit is set to zero and the LOGICAL BLOCK
56 * ADDRESS field is not set to zero, the device server shall
57 * terminate the command with CHECK CONDITION status with
58 * the sense key set to ILLEGAL REQUEST and the additional
59 * sense code set to INVALID FIELD IN CDB.
61 * In SBC-3, these fields are obsolete, but some SCSI
62 * compliance tests actually check this, so we might as well
65 if (!(cdb
[8] & 1) && !!(cdb
[2] | cdb
[3] | cdb
[4] | cdb
[5]))
66 return TCM_INVALID_CDB_FIELD
;
68 if (blocks_long
>= 0x00000000ffffffff)
71 blocks
= (u32
)blocks_long
;
73 buf
[0] = (blocks
>> 24) & 0xff;
74 buf
[1] = (blocks
>> 16) & 0xff;
75 buf
[2] = (blocks
>> 8) & 0xff;
76 buf
[3] = blocks
& 0xff;
77 buf
[4] = (dev
->dev_attrib
.block_size
>> 24) & 0xff;
78 buf
[5] = (dev
->dev_attrib
.block_size
>> 16) & 0xff;
79 buf
[6] = (dev
->dev_attrib
.block_size
>> 8) & 0xff;
80 buf
[7] = dev
->dev_attrib
.block_size
& 0xff;
82 rbuf
= transport_kmap_data_sg(cmd
);
84 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
85 transport_kunmap_data_sg(cmd
);
88 target_complete_cmd_with_length(cmd
, GOOD
, 8);
93 sbc_emulate_readcapacity_16(struct se_cmd
*cmd
)
95 struct se_device
*dev
= cmd
->se_dev
;
96 struct se_session
*sess
= cmd
->se_sess
;
97 int pi_prot_type
= dev
->dev_attrib
.pi_prot_type
;
100 unsigned char buf
[32];
101 unsigned long long blocks
= dev
->transport
->get_blocks(dev
);
103 memset(buf
, 0, sizeof(buf
));
104 buf
[0] = (blocks
>> 56) & 0xff;
105 buf
[1] = (blocks
>> 48) & 0xff;
106 buf
[2] = (blocks
>> 40) & 0xff;
107 buf
[3] = (blocks
>> 32) & 0xff;
108 buf
[4] = (blocks
>> 24) & 0xff;
109 buf
[5] = (blocks
>> 16) & 0xff;
110 buf
[6] = (blocks
>> 8) & 0xff;
111 buf
[7] = blocks
& 0xff;
112 buf
[8] = (dev
->dev_attrib
.block_size
>> 24) & 0xff;
113 buf
[9] = (dev
->dev_attrib
.block_size
>> 16) & 0xff;
114 buf
[10] = (dev
->dev_attrib
.block_size
>> 8) & 0xff;
115 buf
[11] = dev
->dev_attrib
.block_size
& 0xff;
117 * Set P_TYPE and PROT_EN bits for DIF support
119 if (sess
->sup_prot_ops
& (TARGET_PROT_DIN_PASS
| TARGET_PROT_DOUT_PASS
)) {
121 * Only override a device's pi_prot_type if no T10-PI is
122 * available, and sess_prot_type has been explicitly enabled.
125 pi_prot_type
= sess
->sess_prot_type
;
128 buf
[12] = (pi_prot_type
- 1) << 1 | 0x1;
131 if (dev
->transport
->get_lbppbe
)
132 buf
[13] = dev
->transport
->get_lbppbe(dev
) & 0x0f;
134 if (dev
->transport
->get_alignment_offset_lbas
) {
135 u16 lalba
= dev
->transport
->get_alignment_offset_lbas(dev
);
136 buf
[14] = (lalba
>> 8) & 0x3f;
137 buf
[15] = lalba
& 0xff;
141 * Set Thin Provisioning Enable bit following sbc3r22 in section
142 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
144 if (dev
->dev_attrib
.emulate_tpu
|| dev
->dev_attrib
.emulate_tpws
)
147 rbuf
= transport_kmap_data_sg(cmd
);
149 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
150 transport_kunmap_data_sg(cmd
);
153 target_complete_cmd_with_length(cmd
, GOOD
, 32);
157 static sense_reason_t
158 sbc_emulate_startstop(struct se_cmd
*cmd
)
160 unsigned char *cdb
= cmd
->t_task_cdb
;
163 * See sbc3r36 section 5.25
164 * Immediate bit should be set since there is nothing to complete
165 * POWER CONDITION MODIFIER 0h
167 if (!(cdb
[1] & 1) || cdb
[2] || cdb
[3])
168 return TCM_INVALID_CDB_FIELD
;
171 * See sbc3r36 section 5.25
172 * POWER CONDITION 0h START_VALID - process START and LOEJ
174 if (cdb
[4] >> 4 & 0xf)
175 return TCM_INVALID_CDB_FIELD
;
178 * See sbc3r36 section 5.25
179 * LOEJ 0h - nothing to load or unload
180 * START 1h - we are ready
182 if (!(cdb
[4] & 1) || (cdb
[4] & 2) || (cdb
[4] & 4))
183 return TCM_INVALID_CDB_FIELD
;
185 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
189 sector_t
sbc_get_write_same_sectors(struct se_cmd
*cmd
)
193 if (cmd
->t_task_cdb
[0] == WRITE_SAME
)
194 num_blocks
= get_unaligned_be16(&cmd
->t_task_cdb
[7]);
195 else if (cmd
->t_task_cdb
[0] == WRITE_SAME_16
)
196 num_blocks
= get_unaligned_be32(&cmd
->t_task_cdb
[10]);
197 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
198 num_blocks
= get_unaligned_be32(&cmd
->t_task_cdb
[28]);
201 * Use the explicit range when non zero is supplied, otherwise calculate
202 * the remaining range based on ->get_blocks() - starting LBA.
207 return cmd
->se_dev
->transport
->get_blocks(cmd
->se_dev
) -
210 EXPORT_SYMBOL(sbc_get_write_same_sectors
);
212 static sense_reason_t
213 sbc_execute_write_same_unmap(struct se_cmd
*cmd
)
215 struct sbc_ops
*ops
= cmd
->protocol_data
;
216 sector_t nolb
= sbc_get_write_same_sectors(cmd
);
220 ret
= ops
->execute_unmap(cmd
, cmd
->t_task_lba
, nolb
);
225 target_complete_cmd(cmd
, GOOD
);
229 static sense_reason_t
230 sbc_emulate_noop(struct se_cmd
*cmd
)
232 target_complete_cmd(cmd
, GOOD
);
236 static inline u32
sbc_get_size(struct se_cmd
*cmd
, u32 sectors
)
238 return cmd
->se_dev
->dev_attrib
.block_size
* sectors
;
241 static inline u32
transport_get_sectors_6(unsigned char *cdb
)
244 * Use 8-bit sector value. SBC-3 says:
246 * A TRANSFER LENGTH field set to zero specifies that 256
247 * logical blocks shall be written. Any other value
248 * specifies the number of logical blocks that shall be
251 return cdb
[4] ? : 256;
254 static inline u32
transport_get_sectors_10(unsigned char *cdb
)
256 return (u32
)(cdb
[7] << 8) + cdb
[8];
259 static inline u32
transport_get_sectors_12(unsigned char *cdb
)
261 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
264 static inline u32
transport_get_sectors_16(unsigned char *cdb
)
266 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
267 (cdb
[12] << 8) + cdb
[13];
271 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
273 static inline u32
transport_get_sectors_32(unsigned char *cdb
)
275 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
276 (cdb
[30] << 8) + cdb
[31];
280 static inline u32
transport_lba_21(unsigned char *cdb
)
282 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
285 static inline u32
transport_lba_32(unsigned char *cdb
)
287 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
290 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
292 unsigned int __v1
, __v2
;
294 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
295 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
297 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
301 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
303 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
305 unsigned int __v1
, __v2
;
307 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
308 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
310 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
313 static sense_reason_t
314 sbc_setup_write_same(struct se_cmd
*cmd
, unsigned char *flags
, struct sbc_ops
*ops
)
316 struct se_device
*dev
= cmd
->se_dev
;
317 sector_t end_lba
= dev
->transport
->get_blocks(dev
) + 1;
318 unsigned int sectors
= sbc_get_write_same_sectors(cmd
);
321 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
322 pr_err("WRITE_SAME PBDATA and LBDATA"
323 " bits not supported for Block Discard"
325 return TCM_UNSUPPORTED_SCSI_OPCODE
;
327 if (sectors
> cmd
->se_dev
->dev_attrib
.max_write_same_len
) {
328 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
329 sectors
, cmd
->se_dev
->dev_attrib
.max_write_same_len
);
330 return TCM_INVALID_CDB_FIELD
;
333 * Sanity check for LBA wrap and request past end of device.
335 if (((cmd
->t_task_lba
+ sectors
) < cmd
->t_task_lba
) ||
336 ((cmd
->t_task_lba
+ sectors
) > end_lba
)) {
337 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
338 (unsigned long long)end_lba
, cmd
->t_task_lba
, sectors
);
339 return TCM_ADDRESS_OUT_OF_RANGE
;
342 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
343 if (flags
[0] & 0x10) {
344 pr_warn("WRITE SAME with ANCHOR not supported\n");
345 return TCM_INVALID_CDB_FIELD
;
348 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
349 * translated into block discard requests within backend code.
351 if (flags
[0] & 0x08) {
352 if (!ops
->execute_unmap
)
353 return TCM_UNSUPPORTED_SCSI_OPCODE
;
355 if (!dev
->dev_attrib
.emulate_tpws
) {
356 pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
357 " has emulate_tpws disabled\n");
358 return TCM_UNSUPPORTED_SCSI_OPCODE
;
360 cmd
->execute_cmd
= sbc_execute_write_same_unmap
;
363 if (!ops
->execute_write_same
)
364 return TCM_UNSUPPORTED_SCSI_OPCODE
;
366 ret
= sbc_check_prot(dev
, cmd
, &cmd
->t_task_cdb
[0], sectors
, true);
370 cmd
->execute_cmd
= ops
->execute_write_same
;
374 static sense_reason_t
xdreadwrite_callback(struct se_cmd
*cmd
, bool success
)
376 unsigned char *buf
, *addr
;
377 struct scatterlist
*sg
;
379 sense_reason_t ret
= TCM_NO_SENSE
;
382 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
384 * 1) read the specified logical block(s);
385 * 2) transfer logical blocks from the data-out buffer;
386 * 3) XOR the logical blocks transferred from the data-out buffer with
387 * the logical blocks read, storing the resulting XOR data in a buffer;
388 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
389 * blocks transferred from the data-out buffer; and
390 * 5) transfer the resulting XOR data to the data-in buffer.
392 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
394 pr_err("Unable to allocate xor_callback buf\n");
395 return TCM_OUT_OF_RESOURCES
;
398 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
399 * into the locally allocated *buf
401 sg_copy_to_buffer(cmd
->t_data_sg
,
407 * Now perform the XOR against the BIDI read memory located at
408 * cmd->t_mem_bidi_list
412 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
413 addr
= kmap_atomic(sg_page(sg
));
415 ret
= TCM_OUT_OF_RESOURCES
;
419 for (i
= 0; i
< sg
->length
; i
++)
420 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
422 offset
+= sg
->length
;
431 static sense_reason_t
432 sbc_execute_rw(struct se_cmd
*cmd
)
434 struct sbc_ops
*ops
= cmd
->protocol_data
;
436 return ops
->execute_rw(cmd
, cmd
->t_data_sg
, cmd
->t_data_nents
,
437 cmd
->data_direction
);
440 static sense_reason_t
compare_and_write_post(struct se_cmd
*cmd
, bool success
)
442 struct se_device
*dev
= cmd
->se_dev
;
445 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
446 * within target_complete_ok_work() if the command was successfully
447 * sent to the backend driver.
449 spin_lock_irq(&cmd
->t_state_lock
);
450 if ((cmd
->transport_state
& CMD_T_SENT
) && !cmd
->scsi_status
)
451 cmd
->se_cmd_flags
|= SCF_COMPARE_AND_WRITE_POST
;
452 spin_unlock_irq(&cmd
->t_state_lock
);
455 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
456 * before the original READ I/O submission.
463 static sense_reason_t
compare_and_write_callback(struct se_cmd
*cmd
, bool success
)
465 struct se_device
*dev
= cmd
->se_dev
;
466 struct scatterlist
*write_sg
= NULL
, *sg
;
467 unsigned char *buf
= NULL
, *addr
;
468 struct sg_mapping_iter m
;
469 unsigned int offset
= 0, len
;
470 unsigned int nlbas
= cmd
->t_task_nolb
;
471 unsigned int block_size
= dev
->dev_attrib
.block_size
;
472 unsigned int compare_len
= (nlbas
* block_size
);
473 sense_reason_t ret
= TCM_NO_SENSE
;
477 * Handle early failure in transport_generic_request_failure(),
478 * which will not have taken ->caw_sem yet..
480 if (!success
&& (!cmd
->t_data_sg
|| !cmd
->t_bidi_data_sg
))
483 * Handle special case for zero-length COMPARE_AND_WRITE
485 if (!cmd
->data_length
)
488 * Immediately exit + release dev->caw_sem if command has already
489 * been failed with a non-zero SCSI status.
491 if (cmd
->scsi_status
) {
492 pr_err("compare_and_write_callback: non zero scsi_status:"
493 " 0x%02x\n", cmd
->scsi_status
);
497 buf
= kzalloc(cmd
->data_length
, GFP_KERNEL
);
499 pr_err("Unable to allocate compare_and_write buf\n");
500 ret
= TCM_OUT_OF_RESOURCES
;
504 write_sg
= kmalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
507 pr_err("Unable to allocate compare_and_write sg\n");
508 ret
= TCM_OUT_OF_RESOURCES
;
511 sg_init_table(write_sg
, cmd
->t_data_nents
);
513 * Setup verify and write data payloads from total NumberLBAs.
515 rc
= sg_copy_to_buffer(cmd
->t_data_sg
, cmd
->t_data_nents
, buf
,
518 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
519 ret
= TCM_OUT_OF_RESOURCES
;
523 * Compare against SCSI READ payload against verify payload
525 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, i
) {
526 addr
= (unsigned char *)kmap_atomic(sg_page(sg
));
528 ret
= TCM_OUT_OF_RESOURCES
;
532 len
= min(sg
->length
, compare_len
);
534 if (memcmp(addr
, buf
+ offset
, len
)) {
535 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
549 len
= cmd
->t_task_nolb
* block_size
;
550 sg_miter_start(&m
, cmd
->t_data_sg
, cmd
->t_data_nents
, SG_MITER_TO_SG
);
552 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
557 if (block_size
< PAGE_SIZE
) {
558 sg_set_page(&write_sg
[i
], m
.page
, block_size
,
562 sg_set_page(&write_sg
[i
], m
.page
, block_size
,
570 * Save the original SGL + nents values before updating to new
571 * assignments, to be released in transport_free_pages() ->
572 * transport_reset_sgl_orig()
574 cmd
->t_data_sg_orig
= cmd
->t_data_sg
;
575 cmd
->t_data_sg
= write_sg
;
576 cmd
->t_data_nents_orig
= cmd
->t_data_nents
;
577 cmd
->t_data_nents
= 1;
579 cmd
->sam_task_attr
= TCM_HEAD_TAG
;
580 cmd
->transport_complete_callback
= compare_and_write_post
;
582 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
583 * for submitting the adjusted SGL to write instance user-data.
585 cmd
->execute_cmd
= sbc_execute_rw
;
587 spin_lock_irq(&cmd
->t_state_lock
);
588 cmd
->t_state
= TRANSPORT_PROCESSING
;
589 cmd
->transport_state
|= CMD_T_ACTIVE
|CMD_T_BUSY
|CMD_T_SENT
;
590 spin_unlock_irq(&cmd
->t_state_lock
);
592 __target_execute_cmd(cmd
);
598 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
599 dev
->transport
->name
);
600 ret
= TCM_MISCOMPARE_VERIFY
;
603 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
604 * sbc_compare_and_write() before the original READ I/O submission.
612 static sense_reason_t
613 sbc_compare_and_write(struct se_cmd
*cmd
)
615 struct sbc_ops
*ops
= cmd
->protocol_data
;
616 struct se_device
*dev
= cmd
->se_dev
;
620 * Submit the READ first for COMPARE_AND_WRITE to perform the
621 * comparision using SGLs at cmd->t_bidi_data_sg..
623 rc
= down_interruptible(&dev
->caw_sem
);
625 cmd
->transport_complete_callback
= NULL
;
626 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
629 * Reset cmd->data_length to individual block_size in order to not
630 * confuse backend drivers that depend on this value matching the
631 * size of the I/O being submitted.
633 cmd
->data_length
= cmd
->t_task_nolb
* dev
->dev_attrib
.block_size
;
635 ret
= ops
->execute_rw(cmd
, cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
,
638 cmd
->transport_complete_callback
= NULL
;
643 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
644 * upon MISCOMPARE, or in compare_and_write_done() upon completion
645 * of WRITE instance user-data.
651 sbc_set_prot_op_checks(u8 protect
, bool fabric_prot
, enum target_prot_type prot_type
,
652 bool is_write
, struct se_cmd
*cmd
)
655 cmd
->prot_op
= fabric_prot
? TARGET_PROT_DOUT_STRIP
:
656 protect
? TARGET_PROT_DOUT_PASS
:
657 TARGET_PROT_DOUT_INSERT
;
661 cmd
->prot_checks
= 0;
665 cmd
->prot_checks
= TARGET_DIF_CHECK_GUARD
;
666 if (prot_type
== TARGET_DIF_TYPE1_PROT
)
667 cmd
->prot_checks
|= TARGET_DIF_CHECK_REFTAG
;
670 if (prot_type
== TARGET_DIF_TYPE1_PROT
)
671 cmd
->prot_checks
= TARGET_DIF_CHECK_REFTAG
;
674 cmd
->prot_checks
= TARGET_DIF_CHECK_GUARD
;
677 pr_err("Unsupported protect field %d\n", protect
);
681 cmd
->prot_op
= fabric_prot
? TARGET_PROT_DIN_INSERT
:
682 protect
? TARGET_PROT_DIN_PASS
:
683 TARGET_PROT_DIN_STRIP
;
688 cmd
->prot_checks
= TARGET_DIF_CHECK_GUARD
;
689 if (prot_type
== TARGET_DIF_TYPE1_PROT
)
690 cmd
->prot_checks
|= TARGET_DIF_CHECK_REFTAG
;
693 if (prot_type
== TARGET_DIF_TYPE1_PROT
)
694 cmd
->prot_checks
= TARGET_DIF_CHECK_REFTAG
;
697 cmd
->prot_checks
= 0;
700 cmd
->prot_checks
= TARGET_DIF_CHECK_GUARD
;
703 pr_err("Unsupported protect field %d\n", protect
);
711 static sense_reason_t
712 sbc_check_prot(struct se_device
*dev
, struct se_cmd
*cmd
, unsigned char *cdb
,
713 u32 sectors
, bool is_write
)
715 u8 protect
= cdb
[1] >> 5;
716 int sp_ops
= cmd
->se_sess
->sup_prot_ops
;
717 int pi_prot_type
= dev
->dev_attrib
.pi_prot_type
;
718 bool fabric_prot
= false;
720 if (!cmd
->t_prot_sg
|| !cmd
->t_prot_nents
) {
721 if (unlikely(protect
&&
722 !dev
->dev_attrib
.pi_prot_type
&& !cmd
->se_sess
->sess_prot_type
)) {
723 pr_err("CDB contains protect bit, but device + fabric does"
724 " not advertise PROTECT=1 feature bit\n");
725 return TCM_INVALID_CDB_FIELD
;
731 switch (dev
->dev_attrib
.pi_prot_type
) {
732 case TARGET_DIF_TYPE3_PROT
:
733 cmd
->reftag_seed
= 0xffffffff;
735 case TARGET_DIF_TYPE2_PROT
:
737 return TCM_INVALID_CDB_FIELD
;
739 cmd
->reftag_seed
= cmd
->t_task_lba
;
741 case TARGET_DIF_TYPE1_PROT
:
742 cmd
->reftag_seed
= cmd
->t_task_lba
;
744 case TARGET_DIF_TYPE0_PROT
:
746 * See if the fabric supports T10-PI, and the session has been
747 * configured to allow export PROTECT=1 feature bit with backend
748 * devices that don't support T10-PI.
750 fabric_prot
= is_write
?
751 !!(sp_ops
& (TARGET_PROT_DOUT_PASS
| TARGET_PROT_DOUT_STRIP
)) :
752 !!(sp_ops
& (TARGET_PROT_DIN_PASS
| TARGET_PROT_DIN_INSERT
));
754 if (fabric_prot
&& cmd
->se_sess
->sess_prot_type
) {
755 pi_prot_type
= cmd
->se_sess
->sess_prot_type
;
762 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
763 "PROTECT: 0x%02x\n", cdb
[0], protect
);
764 return TCM_INVALID_CDB_FIELD
;
767 if (sbc_set_prot_op_checks(protect
, fabric_prot
, pi_prot_type
, is_write
, cmd
))
768 return TCM_INVALID_CDB_FIELD
;
770 cmd
->prot_type
= pi_prot_type
;
771 cmd
->prot_length
= dev
->prot_length
* sectors
;
774 * In case protection information exists over the wire
775 * we modify command data length to describe pure data.
776 * The actual transfer length is data length + protection
780 cmd
->data_length
= sectors
* dev
->dev_attrib
.block_size
;
782 pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
783 "prot_op=%d prot_checks=%d\n",
784 __func__
, cmd
->prot_type
, cmd
->data_length
, cmd
->prot_length
,
785 cmd
->prot_op
, cmd
->prot_checks
);
791 sbc_check_dpofua(struct se_device
*dev
, struct se_cmd
*cmd
, unsigned char *cdb
)
794 /* see explanation in spc_emulate_modesense */
795 if (!target_check_fua(dev
)) {
796 pr_err("Got CDB: 0x%02x with DPO bit set, but device"
797 " does not advertise support for DPO\n", cdb
[0]);
802 if (!target_check_fua(dev
)) {
803 pr_err("Got CDB: 0x%02x with FUA bit set, but device"
804 " does not advertise support for FUA write\n",
808 cmd
->se_cmd_flags
|= SCF_FUA
;
814 sbc_parse_cdb(struct se_cmd
*cmd
, struct sbc_ops
*ops
)
816 struct se_device
*dev
= cmd
->se_dev
;
817 unsigned char *cdb
= cmd
->t_task_cdb
;
822 cmd
->protocol_data
= ops
;
826 sectors
= transport_get_sectors_6(cdb
);
827 cmd
->t_task_lba
= transport_lba_21(cdb
);
828 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
829 cmd
->execute_cmd
= sbc_execute_rw
;
832 sectors
= transport_get_sectors_10(cdb
);
833 cmd
->t_task_lba
= transport_lba_32(cdb
);
835 if (sbc_check_dpofua(dev
, cmd
, cdb
))
836 return TCM_INVALID_CDB_FIELD
;
838 ret
= sbc_check_prot(dev
, cmd
, cdb
, sectors
, false);
842 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
843 cmd
->execute_cmd
= sbc_execute_rw
;
846 sectors
= transport_get_sectors_12(cdb
);
847 cmd
->t_task_lba
= transport_lba_32(cdb
);
849 if (sbc_check_dpofua(dev
, cmd
, cdb
))
850 return TCM_INVALID_CDB_FIELD
;
852 ret
= sbc_check_prot(dev
, cmd
, cdb
, sectors
, false);
856 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
857 cmd
->execute_cmd
= sbc_execute_rw
;
860 sectors
= transport_get_sectors_16(cdb
);
861 cmd
->t_task_lba
= transport_lba_64(cdb
);
863 if (sbc_check_dpofua(dev
, cmd
, cdb
))
864 return TCM_INVALID_CDB_FIELD
;
866 ret
= sbc_check_prot(dev
, cmd
, cdb
, sectors
, false);
870 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
871 cmd
->execute_cmd
= sbc_execute_rw
;
874 sectors
= transport_get_sectors_6(cdb
);
875 cmd
->t_task_lba
= transport_lba_21(cdb
);
876 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
877 cmd
->execute_cmd
= sbc_execute_rw
;
881 sectors
= transport_get_sectors_10(cdb
);
882 cmd
->t_task_lba
= transport_lba_32(cdb
);
884 if (sbc_check_dpofua(dev
, cmd
, cdb
))
885 return TCM_INVALID_CDB_FIELD
;
887 ret
= sbc_check_prot(dev
, cmd
, cdb
, sectors
, true);
891 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
892 cmd
->execute_cmd
= sbc_execute_rw
;
895 sectors
= transport_get_sectors_12(cdb
);
896 cmd
->t_task_lba
= transport_lba_32(cdb
);
898 if (sbc_check_dpofua(dev
, cmd
, cdb
))
899 return TCM_INVALID_CDB_FIELD
;
901 ret
= sbc_check_prot(dev
, cmd
, cdb
, sectors
, true);
905 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
906 cmd
->execute_cmd
= sbc_execute_rw
;
909 sectors
= transport_get_sectors_16(cdb
);
910 cmd
->t_task_lba
= transport_lba_64(cdb
);
912 if (sbc_check_dpofua(dev
, cmd
, cdb
))
913 return TCM_INVALID_CDB_FIELD
;
915 ret
= sbc_check_prot(dev
, cmd
, cdb
, sectors
, true);
919 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
920 cmd
->execute_cmd
= sbc_execute_rw
;
923 if (cmd
->data_direction
!= DMA_TO_DEVICE
||
924 !(cmd
->se_cmd_flags
& SCF_BIDI
))
925 return TCM_INVALID_CDB_FIELD
;
926 sectors
= transport_get_sectors_10(cdb
);
928 if (sbc_check_dpofua(dev
, cmd
, cdb
))
929 return TCM_INVALID_CDB_FIELD
;
931 cmd
->t_task_lba
= transport_lba_32(cdb
);
932 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
935 * Setup BIDI XOR callback to be run after I/O completion.
937 cmd
->execute_cmd
= sbc_execute_rw
;
938 cmd
->transport_complete_callback
= &xdreadwrite_callback
;
940 case VARIABLE_LENGTH_CMD
:
942 u16 service_action
= get_unaligned_be16(&cdb
[8]);
943 switch (service_action
) {
945 sectors
= transport_get_sectors_32(cdb
);
947 if (sbc_check_dpofua(dev
, cmd
, cdb
))
948 return TCM_INVALID_CDB_FIELD
;
950 * Use WRITE_32 and READ_32 opcodes for the emulated
951 * XDWRITE_READ_32 logic.
953 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
954 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
957 * Setup BIDI XOR callback to be run during after I/O
960 cmd
->execute_cmd
= sbc_execute_rw
;
961 cmd
->transport_complete_callback
= &xdreadwrite_callback
;
964 sectors
= transport_get_sectors_32(cdb
);
966 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
968 return TCM_INVALID_CDB_FIELD
;
971 size
= sbc_get_size(cmd
, 1);
972 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
974 ret
= sbc_setup_write_same(cmd
, &cdb
[10], ops
);
979 pr_err("VARIABLE_LENGTH_CMD service action"
980 " 0x%04x not supported\n", service_action
);
981 return TCM_UNSUPPORTED_SCSI_OPCODE
;
985 case COMPARE_AND_WRITE
:
988 * Currently enforce COMPARE_AND_WRITE for a single sector
991 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
992 " than 1\n", sectors
);
993 return TCM_INVALID_CDB_FIELD
;
995 if (sbc_check_dpofua(dev
, cmd
, cdb
))
996 return TCM_INVALID_CDB_FIELD
;
999 * Double size because we have two buffers, note that
1000 * zero is not an error..
1002 size
= 2 * sbc_get_size(cmd
, sectors
);
1003 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
1004 cmd
->t_task_nolb
= sectors
;
1005 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
| SCF_COMPARE_AND_WRITE
;
1006 cmd
->execute_cmd
= sbc_compare_and_write
;
1007 cmd
->transport_complete_callback
= compare_and_write_callback
;
1010 size
= READ_CAP_LEN
;
1011 cmd
->execute_cmd
= sbc_emulate_readcapacity
;
1013 case SERVICE_ACTION_IN_16
:
1014 switch (cmd
->t_task_cdb
[1] & 0x1f) {
1015 case SAI_READ_CAPACITY_16
:
1016 cmd
->execute_cmd
= sbc_emulate_readcapacity_16
;
1018 case SAI_REPORT_REFERRALS
:
1019 cmd
->execute_cmd
= target_emulate_report_referrals
;
1022 pr_err("Unsupported SA: 0x%02x\n",
1023 cmd
->t_task_cdb
[1] & 0x1f);
1024 return TCM_INVALID_CDB_FIELD
;
1026 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
1027 (cdb
[12] << 8) | cdb
[13];
1029 case SYNCHRONIZE_CACHE
:
1030 case SYNCHRONIZE_CACHE_16
:
1031 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
1032 sectors
= transport_get_sectors_10(cdb
);
1033 cmd
->t_task_lba
= transport_lba_32(cdb
);
1035 sectors
= transport_get_sectors_16(cdb
);
1036 cmd
->t_task_lba
= transport_lba_64(cdb
);
1038 if (ops
->execute_sync_cache
) {
1039 cmd
->execute_cmd
= ops
->execute_sync_cache
;
1043 cmd
->execute_cmd
= sbc_emulate_noop
;
1046 if (!ops
->execute_unmap
)
1047 return TCM_UNSUPPORTED_SCSI_OPCODE
;
1049 if (!dev
->dev_attrib
.emulate_tpu
) {
1050 pr_err("Got UNMAP, but backend device has"
1051 " emulate_tpu disabled\n");
1052 return TCM_UNSUPPORTED_SCSI_OPCODE
;
1054 size
= get_unaligned_be16(&cdb
[7]);
1055 cmd
->execute_cmd
= sbc_execute_unmap
;
1058 sectors
= transport_get_sectors_16(cdb
);
1060 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1061 return TCM_INVALID_CDB_FIELD
;
1064 size
= sbc_get_size(cmd
, 1);
1065 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
1067 ret
= sbc_setup_write_same(cmd
, &cdb
[1], ops
);
1072 sectors
= transport_get_sectors_10(cdb
);
1074 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1075 return TCM_INVALID_CDB_FIELD
;
1078 size
= sbc_get_size(cmd
, 1);
1079 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
1082 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1083 * of byte 1 bit 3 UNMAP instead of original reserved field
1085 ret
= sbc_setup_write_same(cmd
, &cdb
[1], ops
);
1091 sectors
= transport_get_sectors_10(cdb
);
1092 cmd
->t_task_lba
= transport_lba_32(cdb
);
1093 cmd
->execute_cmd
= sbc_emulate_noop
;
1099 * There are still clients out there which use these old SCSI-2
1100 * commands. This mainly happens when running VMs with legacy
1101 * guest systems, connected via SCSI command pass-through to
1102 * iSCSI targets. Make them happy and return status GOOD.
1105 cmd
->execute_cmd
= sbc_emulate_noop
;
1109 cmd
->execute_cmd
= sbc_emulate_startstop
;
1112 ret
= spc_parse_cdb(cmd
, &size
);
1117 /* reject any command that we don't have a handler for */
1118 if (!cmd
->execute_cmd
)
1119 return TCM_UNSUPPORTED_SCSI_OPCODE
;
1121 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) {
1122 unsigned long long end_lba
;
1124 end_lba
= dev
->transport
->get_blocks(dev
) + 1;
1125 if (((cmd
->t_task_lba
+ sectors
) < cmd
->t_task_lba
) ||
1126 ((cmd
->t_task_lba
+ sectors
) > end_lba
)) {
1127 pr_err("cmd exceeds last lba %llu "
1128 "(lba %llu, sectors %u)\n",
1129 end_lba
, cmd
->t_task_lba
, sectors
);
1130 return TCM_ADDRESS_OUT_OF_RANGE
;
1133 if (!(cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
))
1134 size
= sbc_get_size(cmd
, sectors
);
1137 return target_cmd_size_check(cmd
, size
);
1139 EXPORT_SYMBOL(sbc_parse_cdb
);
1141 u32
sbc_get_device_type(struct se_device
*dev
)
1145 EXPORT_SYMBOL(sbc_get_device_type
);
1147 static sense_reason_t
1148 sbc_execute_unmap(struct se_cmd
*cmd
)
1150 struct sbc_ops
*ops
= cmd
->protocol_data
;
1151 struct se_device
*dev
= cmd
->se_dev
;
1152 unsigned char *buf
, *ptr
= NULL
;
1156 sense_reason_t ret
= 0;
1159 /* We never set ANC_SUP */
1160 if (cmd
->t_task_cdb
[1])
1161 return TCM_INVALID_CDB_FIELD
;
1163 if (cmd
->data_length
== 0) {
1164 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
1168 if (cmd
->data_length
< 8) {
1169 pr_warn("UNMAP parameter list length %u too small\n",
1171 return TCM_PARAMETER_LIST_LENGTH_ERROR
;
1174 buf
= transport_kmap_data_sg(cmd
);
1176 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1178 dl
= get_unaligned_be16(&buf
[0]);
1179 bd_dl
= get_unaligned_be16(&buf
[2]);
1181 size
= cmd
->data_length
- 8;
1183 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1184 cmd
->data_length
, bd_dl
);
1188 if (size
/ 16 > dev
->dev_attrib
.max_unmap_block_desc_count
) {
1189 ret
= TCM_INVALID_PARAMETER_LIST
;
1193 /* First UNMAP block descriptor starts at 8 byte offset */
1195 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1196 " ptr: %p\n", dev
->transport
->name
, dl
, bd_dl
, size
, ptr
);
1198 while (size
>= 16) {
1199 lba
= get_unaligned_be64(&ptr
[0]);
1200 range
= get_unaligned_be32(&ptr
[8]);
1201 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1202 (unsigned long long)lba
, range
);
1204 if (range
> dev
->dev_attrib
.max_unmap_lba_count
) {
1205 ret
= TCM_INVALID_PARAMETER_LIST
;
1209 if (lba
+ range
> dev
->transport
->get_blocks(dev
) + 1) {
1210 ret
= TCM_ADDRESS_OUT_OF_RANGE
;
1214 ret
= ops
->execute_unmap(cmd
, lba
, range
);
1223 transport_kunmap_data_sg(cmd
);
1225 target_complete_cmd(cmd
, GOOD
);
1230 sbc_dif_generate(struct se_cmd
*cmd
)
1232 struct se_device
*dev
= cmd
->se_dev
;
1233 struct t10_pi_tuple
*sdt
;
1234 struct scatterlist
*dsg
= cmd
->t_data_sg
, *psg
;
1235 sector_t sector
= cmd
->t_task_lba
;
1236 void *daddr
, *paddr
;
1237 int i
, j
, offset
= 0;
1238 unsigned int block_size
= dev
->dev_attrib
.block_size
;
1240 for_each_sg(cmd
->t_prot_sg
, psg
, cmd
->t_prot_nents
, i
) {
1241 paddr
= kmap_atomic(sg_page(psg
)) + psg
->offset
;
1242 daddr
= kmap_atomic(sg_page(dsg
)) + dsg
->offset
;
1244 for (j
= 0; j
< psg
->length
;
1245 j
+= sizeof(*sdt
)) {
1249 if (offset
>= dsg
->length
) {
1250 offset
-= dsg
->length
;
1251 kunmap_atomic(daddr
- dsg
->offset
);
1254 kunmap_atomic(paddr
- psg
->offset
);
1257 daddr
= kmap_atomic(sg_page(dsg
)) + dsg
->offset
;
1261 avail
= min(block_size
, dsg
->length
- offset
);
1262 crc
= crc_t10dif(daddr
+ offset
, avail
);
1263 if (avail
< block_size
) {
1264 kunmap_atomic(daddr
- dsg
->offset
);
1267 kunmap_atomic(paddr
- psg
->offset
);
1270 daddr
= kmap_atomic(sg_page(dsg
)) + dsg
->offset
;
1271 offset
= block_size
- avail
;
1272 crc
= crc_t10dif_update(crc
, daddr
, offset
);
1274 offset
+= block_size
;
1277 sdt
->guard_tag
= cpu_to_be16(crc
);
1278 if (cmd
->prot_type
== TARGET_DIF_TYPE1_PROT
)
1279 sdt
->ref_tag
= cpu_to_be32(sector
& 0xffffffff);
1282 pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1283 " app_tag: 0x%04x ref_tag: %u\n",
1284 (cmd
->data_direction
== DMA_TO_DEVICE
) ?
1285 "WRITE" : "READ", (unsigned long long)sector
,
1286 sdt
->guard_tag
, sdt
->app_tag
,
1287 be32_to_cpu(sdt
->ref_tag
));
1292 kunmap_atomic(daddr
- dsg
->offset
);
1293 kunmap_atomic(paddr
- psg
->offset
);
1297 static sense_reason_t
1298 sbc_dif_v1_verify(struct se_cmd
*cmd
, struct t10_pi_tuple
*sdt
,
1299 __u16 crc
, sector_t sector
, unsigned int ei_lba
)
1303 if (!(cmd
->prot_checks
& TARGET_DIF_CHECK_GUARD
))
1306 csum
= cpu_to_be16(crc
);
1308 if (sdt
->guard_tag
!= csum
) {
1309 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1310 " csum 0x%04x\n", (unsigned long long)sector
,
1311 be16_to_cpu(sdt
->guard_tag
), be16_to_cpu(csum
));
1312 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED
;
1316 if (!(cmd
->prot_checks
& TARGET_DIF_CHECK_REFTAG
))
1319 if (cmd
->prot_type
== TARGET_DIF_TYPE1_PROT
&&
1320 be32_to_cpu(sdt
->ref_tag
) != (sector
& 0xffffffff)) {
1321 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1322 " sector MSB: 0x%08x\n", (unsigned long long)sector
,
1323 be32_to_cpu(sdt
->ref_tag
), (u32
)(sector
& 0xffffffff));
1324 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
;
1327 if (cmd
->prot_type
== TARGET_DIF_TYPE2_PROT
&&
1328 be32_to_cpu(sdt
->ref_tag
) != ei_lba
) {
1329 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1330 " ei_lba: 0x%08x\n", (unsigned long long)sector
,
1331 be32_to_cpu(sdt
->ref_tag
), ei_lba
);
1332 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED
;
1338 void sbc_dif_copy_prot(struct se_cmd
*cmd
, unsigned int sectors
, bool read
,
1339 struct scatterlist
*sg
, int sg_off
)
1341 struct se_device
*dev
= cmd
->se_dev
;
1342 struct scatterlist
*psg
;
1344 unsigned int i
, len
, left
;
1345 unsigned int offset
= sg_off
;
1350 left
= sectors
* dev
->prot_length
;
1352 for_each_sg(cmd
->t_prot_sg
, psg
, cmd
->t_prot_nents
, i
) {
1353 unsigned int psg_len
, copied
= 0;
1355 paddr
= kmap_atomic(sg_page(psg
)) + psg
->offset
;
1356 psg_len
= min(left
, psg
->length
);
1358 len
= min(psg_len
, sg
->length
- offset
);
1359 addr
= kmap_atomic(sg_page(sg
)) + sg
->offset
+ offset
;
1362 memcpy(paddr
+ copied
, addr
, len
);
1364 memcpy(addr
, paddr
+ copied
, len
);
1371 kunmap_atomic(addr
- sg
->offset
- offset
);
1373 if (offset
>= sg
->length
) {
1378 kunmap_atomic(paddr
- psg
->offset
);
1381 EXPORT_SYMBOL(sbc_dif_copy_prot
);
1384 sbc_dif_verify(struct se_cmd
*cmd
, sector_t start
, unsigned int sectors
,
1385 unsigned int ei_lba
, struct scatterlist
*psg
, int psg_off
)
1387 struct se_device
*dev
= cmd
->se_dev
;
1388 struct t10_pi_tuple
*sdt
;
1389 struct scatterlist
*dsg
= cmd
->t_data_sg
;
1390 sector_t sector
= start
;
1391 void *daddr
, *paddr
;
1395 unsigned int block_size
= dev
->dev_attrib
.block_size
;
1397 for (; psg
&& sector
< start
+ sectors
; psg
= sg_next(psg
)) {
1398 paddr
= kmap_atomic(sg_page(psg
)) + psg
->offset
;
1399 daddr
= kmap_atomic(sg_page(dsg
)) + dsg
->offset
;
1401 for (i
= psg_off
; i
< psg
->length
&&
1402 sector
< start
+ sectors
;
1403 i
+= sizeof(*sdt
)) {
1407 if (dsg_off
>= dsg
->length
) {
1408 dsg_off
-= dsg
->length
;
1409 kunmap_atomic(daddr
- dsg
->offset
);
1412 kunmap_atomic(paddr
- psg
->offset
);
1415 daddr
= kmap_atomic(sg_page(dsg
)) + dsg
->offset
;
1420 pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1421 " app_tag: 0x%04x ref_tag: %u\n",
1422 (unsigned long long)sector
, sdt
->guard_tag
,
1423 sdt
->app_tag
, be32_to_cpu(sdt
->ref_tag
));
1425 if (sdt
->app_tag
== cpu_to_be16(0xffff)) {
1426 dsg_off
+= block_size
;
1430 avail
= min(block_size
, dsg
->length
- dsg_off
);
1431 crc
= crc_t10dif(daddr
+ dsg_off
, avail
);
1432 if (avail
< block_size
) {
1433 kunmap_atomic(daddr
- dsg
->offset
);
1436 kunmap_atomic(paddr
- psg
->offset
);
1439 daddr
= kmap_atomic(sg_page(dsg
)) + dsg
->offset
;
1440 dsg_off
= block_size
- avail
;
1441 crc
= crc_t10dif_update(crc
, daddr
, dsg_off
);
1443 dsg_off
+= block_size
;
1446 rc
= sbc_dif_v1_verify(cmd
, sdt
, crc
, sector
, ei_lba
);
1448 kunmap_atomic(daddr
- dsg
->offset
);
1449 kunmap_atomic(paddr
- psg
->offset
);
1450 cmd
->bad_sector
= sector
;
1459 kunmap_atomic(daddr
- dsg
->offset
);
1460 kunmap_atomic(paddr
- psg
->offset
);
1465 EXPORT_SYMBOL(sbc_dif_verify
);